Data-driven decision-making is essential for SaaS product teams to optimize processes, enhance customer satisfaction, and drive growth, with user-attributed data providing deeper insights. The article explains how PostHog, an open-source product analytics platform, can be integrated with Clerk to associate events with individual users, enhancing the understanding of user behavior. This process is demonstrated within the Kozi project, a knowledge management SaaS built using Next.js, Neon, and Clerk, which uses PostHog to track events like page views and task creation. By incorporating Clerk's user data into PostHog, developers can enrich their analytics, identify feature usage, and make informed decisions to improve their products. The integration involves using PostHog's identify function to link sessions to users and the capture function to log user interactions, enabling the tracking of both standard and custom events, which can reveal valuable usage trends.